Here is the exception generated for a project after upgrading my subversion
server from 1.5 to 1.6.1 (am using Visual SVN Server for Windows on a Windows
2003 box). Note: This does not happen with other projects I have on the same
Hudson instance.

started
Checking out https://F8CODEIDEV.statcan.ca:8443/svn/jss/trunk
ERROR: Failed to check out https://F8CODEIDEV.statcan.ca:8443/svn/jss/trunk
org.tmatesoft.svn.core.SVNException: svn: Path
'https://F8CODEIDEV.statcan.ca:8443/svn/jss/trunk' is not canonicalized; there
is a problem with the client.
svn: REPORT of '/svn/jss/!svn/vcc/default': 400 Bad Request
(https://F8CODEIDEV.statcan.ca:8443)
at
org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:64)
at
org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:51)
at
org.tmatesoft.svn.core.internal.io.dav.DAVRepository.runReport(DAVRepository.java:1214)
at
org.tmatesoft.svn.core.internal.io.dav.DAVRepository.update(DAVRepository.java:1078)
at
org.tmatesoft.svn.core.wc.SVNUpdateClient.update(SVNUpdateClient.java:449)
at
org.tmatesoft.svn.core.wc.SVNUpdateClient.doCheckout(SVNUpdateClient.java:851)
at
org.tmatesoft.svn.core.wc.SVNUpdateClient.doCheckout(SVNUpdateClient.java:728)
at hudson.scm.SubversionSCM$CheckOutTask.invoke(SubversionSCM.java:505)
at hudson.scm.SubversionSCM$CheckOutTask.invoke(SubversionSCM.java:435)
at hudson.FilePath.act(FilePath.java:434)
at hudson.scm.SubversionSCM.checkout(SubversionSCM.java:428)
at hudson.scm.SubversionSCM.checkout(SubversionSCM.java:377)
at hudson.model.AbstractProject.checkout(AbstractProject.java:743)
at
hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:305)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:262)
at hudson.model.Run.run(Run.java:866)
at hudson.model.Build.run(Build.java:112)
at hudson.model.ResourceController.execute(ResourceController.java:93)
at hudson.model.Executor.run(Executor.java:119)
[WARNINGS] Parsing warnings in log file...
[WARNINGS] A total of 0 annotations have been found for priority HIGH
[WARNINGS] A total of 0 annotations have been found for priority NORMAL
[WARNINGS] A total of 0 annotations have been found for priority LOW
No Subversion tagging for unsuccessful build.
finished: FAILURE